If you'd like, we can do some logarithms for you to help calculate that; open up a support ticket for a power amplifier recommendation at support.outlawaudio.com . We would need to know impedance of the driver as well as sensitivity and room size. There are obviously some things we can't take into account for remotely, like destructive interference and the impact of your cabinet. We would have to calculate the power assuming nothing negative was occurring, (which is almost never the case), and then recommend additional headroom for when there is.